Apparently, it is HE that did not perform said action. I did, I KNOW that the group list is plural. He apparently does not, therefore, YES, it was a stupid remark on his part, and a good jab on mine.
NOPE... ANY Usenet post carries ALL the groups it was posted too, so if he was able to read the post, he was able to see the group list it was posted to. If that is not the case, then you guys need to re-think what you call news client software over there, and no, goddamned idiots reading the NEWS over a web interface do NOT get to make ANY remarks about groups, since they are like a damned horse with blinders on to start with.